Welcome to the Water Treatment Operator 50 Question Practice Test.
Choose the best possible answer to the question.
1.
Most regulated contaminants in drinking water?
2.
Fine solids that remain suspended in water and will not settle on their own are known as?
3.
The porous material just above the water table that holds small quantities of water by capillary action is called?
4.
How much does water expand by when it freezes compared to its original value?
5.
An organic particle that is stabilized by attracting a layer of water molecules to its surface is known as a?
6.
What process would be most effective for the destruction of heterotrophic bacteria?
7.
What adjustments will the operator of a surface water treatment plant have to make if the raw water is very high in turbidity levels?
8.
What is the best process for sequestering manganese?
9.
If a water system collects at least 40 samples per month for total coliform analysis, no more than 20% of samples can come back positive.
10.
During filtration, what role does the action of straining of suspended particles play?
11.
If the continuous monitoring of the residual disinfectant concentration of the water entering the water system fails, how often will an operator need to collect a grab sample until the problem is fixed?
12.
The maximum amount of time that between draining, cleaning, and inspection of sedimentation basins with mechanical sludge removal components is?
13.
What angle should the parallel inclined plates be installed when using the shallow depth sedimentation method?
14.
A pump should always be insatlled?
15.
What type of polar bonds are between the hydrogen atoms and the oxygen atom in water?
16.
What conditions will +Eh values of water support?
17.
What determines whether or not colloidal sized particles in suspension repel each other, stay in suspension, or agglomerate and eventually settle?
18.
What is the best addition for water that is highly colored due to organic matter?
19.
What is the purpose of body feed in the operation of a diatomaceous earth filter?
20.
What percentage of the air is usually converted to ozone if air is used to generate ozone?
21.
What test is used to determine the presence of coliform bacteria?
22.
The pH scale ranges from?
23.
How often should the fluoride feed system be checked?
24.
Pure water can be found?
25.
Vegetation control in and around reservoirs is practiced to control the release of chemical compounds that
26.
Salts, Bases, and Acids lacking carbon are organic compounds.
27.
Community and non-transient community water systems must test for what if they use ozone for disinfection of oxidation?
28.
What does a high pH favor the formation of?
29.
One of the steps taken to determine the threshold odor number is?
30.
Nitrification in the distribution system can best be described as?
31.
Test results from a multiple tube fermentation test for coliform bacteria are expressed as MPN (most probable number) per 100 milliliters, the number is determined from?
32.
What term describes the gathering of colloids into larger particles?
33.
In what form is Iron soluble in water?
34.
What does the saturation point of calcium carbonate primarily depend on?
35.
Powered activated carbon is usually used to control what?
36.
Which of the following illnesses is it hardest to kill the organism that causes the illness?
37.
The Colilert test (ONPG-MUG) shows the presence of total coliforms is shown by?
38.
What does the pulsating energy in a pulsator clarifier help to do?
39.
Ion exchange processes can typically be used for direct groundwater treatment as long as turbidity and what else have levels that are not excessive?
40.
A change in the water elevation from the normal level to the pumping level is?
41.
What will ion exchange remove?
42.
Reaching breakpoint chlorination means?
43.
Adding CO2 to water will?
44.
During daylight hours, algae growth in a reservoir will do what?
45.
A constituent dissolved in source water that will precipitate when oxidized is?
46.
The Marble test is associated with?
47.
Detention time in flocculation basins are usually designed to provide for?
48.
What would be the short term goal when a water source is destroyed or damaged by some type of disaster that causes total contamination?
49.
The hydrologic cycles create what two primary sources of water?
50.
At what temperature does the maximum density of water occur?
